Getting comfortable in a committed relationship

my bf and I have been together for nearly two years. We started off as friends but both admitted we’ve been interested in the other romantically for years. When our relationship first kicked off, he was all over me, wanted to see me every chance he got, said the sweetest things to me, etc. Come January, college baseball season came and he was on the field for hours at a time, coming home tired and unenthused (we are long distance during the school year so I expect to talk but he typically gets tired quickly). Summer is here and we’re both home, but he works from 7:30-4:30 each day. Point is, I just feel like the spark is lost. I still love him more than life, but he’s more comfortably picking on me more, not seeing me as much, not being as touchy, etc. I figured it was due to just being busy and stressed but I wanted to clarify his feelings hasn’t changed just because he’s acting a bit different. When I suggested it, he got really hurt and told me he couldn’t believe I’d ever say that, that he is in fact just tired and still loves me just as much. Is this typical of long term relationships? Am I overthinking to feel less “loved”? I don’t want to make the mistake of losing my best friend due to a common relationship milestone. Thanks!!